<!DOCTYPE html>
<html>
    <head>
        <meta charset='utf-8' />
        <style>
           a:link{color:red;}
           a:visited{color:green;}
           a:hover{color:blue;}
           a:active{color:yellow;}
        </style>
    </head>
    <body>
        <a href='http://www.baidu.com'>百百度度</a>
       <ul>
            <li>aaaaaaaa</li>
            <li style='border:1px solid red;'>aaaaaaaa
                 <ol>
                    <li id='aaa'>bbbbbbbb</li>
                    <li>bbbbbbbb</li>
                    <li>xxxxxxxx</li>
                    <li>OOOOOOOO</li>
                 </ol>
            </li>
            <li>aaaaaaaa</li>
            <li>aaaaaaaa</li>
            <li>aaaaaaaa</li>
            <li>aaaaaaaa</li>
       </ul>
    </body>
</html>